Improvement in metallic sieves



T. P. AUSTIN. Metallic Sieve.

No. 218,808. Patented Aug. 26,1879.

Fig.1

MPETERS, PHO O-LITHQGMFHER. WASHINGTON u c UNITED STATESPATENT OFFICE.

THEODORE -P. AUSTIN, OF PORTLAND, CONNECTICUT, ASSIGNOR, BY MESNEASSIGNMENTS, TO THE UNITED STATES STAMPING COMPANY, OF N EIV YORK ClTY.

1 IMPROVEMENT IN METALLIC SIEVES.

Specification forming part of Letters Patent No. 2] 8,808, dated August26, 1879; application filed August 14,1878.

To all whom it may concern:

Be it known that I, THEODORE P. AUSTIN, of Portland, in the county ofMiddlesex and State of Connecticut, have invented certain new and usefulImprovements relating to'Metallic Sieves, of which the following is aspecification.

I have succeeded in producing a sieve with the wire-gauze tightlystrained and effectively secured with little complication, in a mannerwhich requires little labor or skill.

I believe my sieve will be much more durable than any ordinaryconstruction.

The following is a description of what I consider the best means ofcarrying out the invention.

The accompanying drawings form a part of this specification.

Figure 1 is a central section through aring of sheetmetal partiallyformed according to myinvention. This is the piece by which thewirecloth is to be finally strained and kept in the proper extendedcondition, andimmediately be- 10W thisis shown in section the wire-clothwhich isto apply therein. Fig. 2 represents the wirecloth in position.The wire-cloth has its edges raised by stamping or otherwise, and isinserted in position within the sheet metal ready to be confined andstrained vby further treatment. Fig. 3 shows the same after it has beencompletely formed by folding the sheet-metal ring and the accompanyingwire-cloth completely into position. This figureshows the parts as flat.In practice they assume, and I prefer they shall assume,aslightly-rounded position. Fig. 3 is a sectional portion on a largerscale, showing the rounded condition which obtains in practice. Fig. 4is a section of the lower portion of a partially-formed hoop or band-thesides proper-of the sieve. In this figure the hoop has been forcedinward to produce the shelf or support underlying the wire-cloth and itsstraining-ring. I have indicated in dotted lines a condition of themetal above which the hoop may be afterward made to assume preparatoryto the final crushing down of the metal into the form shown in Fig. 5.Fig. 5 is a section through the completed sieve, showing the metal ofthe hoop collapsed or crushed down to form a tight nip or hold on thewirecloth and its straining-ring on the upper side as well as on thelower. This is the completed stage of the construction. In practice Ipress down the metal a little farther than is here shown.

Similar letters of reference indicate like parts in all the figureswhere they occur.

A is a circular sheet of wire-cloth, having a turned-up edge, A. This isthe condition in which the wire-cloth is introduced into itsstraining-rm g. The strainin g-rin g is indicated in Fig. 1 by B B 13*.There are two unequal folds, the fold B being the shortest. A littlespace is left between the parts B and B B sufficient to easily receivethe lip. or turned-up edge A of the wire-cloth. After these parts areapplied together, as indicated in Fig. 2, they are afterward treated indies which fold the whole into the condition shown in Fig.3, or, moreexactly, in the condition shown in Fig. 3 In this folding operation,changing the condition from that in Fig. 2 to that in Fig. 3, the upperparts, B B, are folded inward, and the lower part, B is also folded inward. This movement tends to induce a contraction of the upper and loweredges. The metal resists this contraction, and the result is acompromise. The middle portion of the strainin g-rin g grasps tightly onthe wire-cloth and is distended. In other words, the straining-ringassumes a mean condition as to diameter. The inner edge of thestraining-ring is of less diameter than before, and the outer edge orthe extreme periphery of the straining-ring is of greater diameter thanbefore. In this greater diameter it carries the annexed portion of theWire-cloth with it. It thereby imparts a properly severe and permanentlyremaining strain to the wire-cloth.

D D is a band or hoop of sheet metal, which forms the sides of thesieve. Its upper edge (not represented) may be wired or finished in anyapproved manner. Its lower edge is wired or hemmed, as shown. At aproper distance above the lower edge I form acontinuous internal bead, Dextending quite around. This forms a shelf, upon which the wire-clothand its straining-hoop B B B are confined. V

Above the wire-cloth and its straining-rin g I first indent the metal alittle by any suitable tool, and subsequently fold it down tightly. Thedotted lines in Fig. 4 represent what I may describe as the firstinternal beadin g above the Wire-cloth. This lays out the properquantity of metal for the. upper internal head, 1). (Shown nearly fullycompleted in Fig. 5.)

I believe that the final forming down or crushing of lhe internal bead,D may be produced by Wheeling or by dies. I have not completed myexperiments in that portion of the work. I do not confine myself to anypartic ular method or process of forming the bead. The commencement ofthis head may be pro duced in the treatment of the hoop before thewire-cloth and its straining-ring are inserted. I believe that it ispracticable to spring in the wire-cloth and its attachment after themetal of the hoop has been formed inward to an extent fully as great asis indicated by the dotted lines in Fig. 4.

No solder is required in thus carrying out this invention. 1 can,however, it I prefer,

solder the wire-cloth A A to its straining-ring, B B B or solder thelatter to the inclosinghoop, D D D or both.

I claim as my invention 1. The wire-cloth A, having a turned edge, A, incombination with a flattened strainingring formed of the folded sheetmetal B B B*, the said edge A being inclosed between the folds B B, anda portion of A being inclosed between B and B and the folds B B' B beingall in planes parallel with the wire-cloth A, substantially asdescribed, the wire-cloth being stretched in folding the said rings, asset forth.

2. The metallic sieve described, having a straining-ring, B B B,wire-cloth A A, and hoop or sides I) I) D, as herein specified.

In testimony whereof I have hereunto set my hand this 13th day ofAugust, 1878, in the presence of two subscribing witnesses.

THEO. P. AUSTIN.

Witnesses:

W. COLBORNE BROOKES, W. L. BENNEM.

